Proxy subdomains with Cluster DNS not working properly

I have 3 Cluster DNS servers. When I create a new account, the new DNS zone will be copied to all of those Cluster DNS servers.
I also have enabled proxy subdomains, and enabled it to be created automatically when I create new account.

But here is a problem I just found:
When I create a new account, the new DNS zone is copied to the Cluster DNS servers before the proxy subdomains are created, as a result of this, the Cluster DNS servers don't have the proxy subdomains unless I sync the zone once after account creation.

Basically WHM now works like this: Create account -> copy new DNS zone to Cluster DNS servers -> create proxy subdomains
But actually it should sync again after creating proxy subdomains, or it should create them before the first sync.